Writing instrument



FIG. 1 is a top perspective view of a writing instrument embodying my is new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof, a right side elevational being a mirror image thereof;

FIG. 7 is a bottom perspective view thereof; and,

FIG. 8 is a top perspective view thereof with the writing tip extended. 

The ornamental design for a writing instrument, as shown and described. 